Gelastic seizure
（重定向自Gelastic）
A gelastic seizure, also known as "gelastic epilepsy" is a rare type of seizure that involves a sudden burst of energy, usually in the form of laughing or crying. This syndrome usually occurs for no obvious reason and is uncontrollable. It is slightly more common in males than females. The term Gelastic originates from the Greek word "Gelos" which means laughter. This syndrome can go for very long periods of time without a diagnosis, as it may appear to be much like normal laughing or crying, if it occurs infrequently. It has been associated with several different conditions such as temporal and frontal lobe lesions, tumors, atrophy, tuberous sclerosis, hemangiomas, and post infectious foci, but mainly hypothalamic hamartomas.